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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6010e246f9e1704e6590dd29172931f918c7e992e376f939bd02c61075a68c26' 
  AND token = 'Xgs/35A6NxKMDqOmJp3sV/FCME/SC6l44aj14Vtf9T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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