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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cce99338f04b1a5685626fbe80a86f3a8da2cc9ff7dab1d013fe8303d46c786' 
  AND token = 'ARIlFkZEugdA0U6QVtAHL643nESpd4YOn0wkNsO3VNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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