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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae8d685f73311d459b96ec10d41b9f41c565072e14c856f57229e10f773a0b1' 
  AND token = '7/slifyyahQT+GNSCRrm7GoZh703USAzjAF+QQ2rECI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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