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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0323770a8323409b5c1425f5d6db3b77d72c0b5640c0cac21e2c6b896b32d1d6' 
  AND token = 'uulFtzMxrN4IE71S1aE4thbZCoSxsaemm388xgGLEVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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