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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f50acdd4321b3aac1f8a3c575065bcf8a66d079c13886b1e60f062516deefe5' 
  AND token = '5U4lt4NWpkOqLdSl6Zk9RlaDtxoBuFjCE+nHW7swGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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