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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e02a4481da05afc23c07f8ef4e0e3c8a107fcf51f47a8ce1b676f86cd04c88' 
  AND token = '+xUtTGD1ZVePsIrdlLUwofaATnKU8Galub9S8QHxEss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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