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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67bb5eb64c4969dcebdd64a77269a45968adf8f6752af1884a473d421458adf' 
  AND token = 'B1332Bq2d3ddLHFOXtMomCv9ozX3yWeQT/w9goi6AoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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