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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571645a65971b8903574a4e74551927d6a87a6bd4f3405b3d6a04dfe30e5d43c' 
  AND token = 'HZ7U1bRSynUI9+2ELFTnSfXYp/e00mtPY19iXVrB0H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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