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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0388fe28eda0ff948b29ca85ce70762da36632dea232b9af7fb540e7bc2ce3' 
  AND token = 'SN9ZhiW7jLC4aduer7lG75zVDTQKk1ouNwt+s8U0tUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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