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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da2e7e179cbae24fac18cf9f83d8d0acbf9509a067971f8cae8da55d1d4c5bd' 
  AND token = '0pxN4xcuY4aWA9A76zX2Mwh+XziPI/2cydRUY82awXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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