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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8ccf91c35b7fa059f6ace5b6f67a739257ec8d35d07a9c8d8b7d90ebf2200a' 
  AND token = 'gq50kFTJDqW59oKqiTpzAFJe1om4qZiRz3OcqhdMj/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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