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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c608b3ab4caba149c0e8009829b9294c057c02df0052c3a07501570ac20ac4d6' 
  AND token = 'UAZXTDYjaJzrUPm5p99Pb4c6JYtYWPWj6nfuCPU/Xzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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