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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f7f83cba606c8eb2302ca155c6db74ce53b2826e34408b0267bb3d7338c829' 
  AND token = 'Z6QJKZM+H3gqLdmokPXnfP46U8Pld6DZJQezbm1UHTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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