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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cde8521f46be4f9f8e6a29b16c318b98dc3a0872f67cc329e32bab359daa7c' 
  AND token = 'p9P6tdFXiIby1U9F9JeAtuZC1ADQ+sL1JCyOzmYve0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}