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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62354ad999bcee5deb3825d29bd3ec9e05c48c56597c7eac87d900ae340e8bc5' 
  AND token = 'uTk1AnTAbnNsAgHkPUrRmPMD6UdslMhEMh4gxfgvn9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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