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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c118a04bb49eab4370ac0c234d42859cf1021c68a61ed8c91b0aa454a92959aa' 
  AND token = 'PYS3wliGc8P2s2BZp1k7U9O6txKgkxcnMSIAQl163QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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