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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c140b03fdd8243f601485843aa159825dcfd2a333246a5ca3103ed26f8fe1c' 
  AND token = '6JXB796iYSdxNaYDYqUbEVRLKq1KyV6othT4Wu5VMaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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