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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230b1a178b080dedd8743196823fba41b4c061f681ee7df8a1659325acda9557' 
  AND token = '0sabNIR0qNtnQhmJlOOt/hMvRzhFJ/hekKt575x/vco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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