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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664b85c82f69c589406fd59628eaf5f081eab42d3f96409a0a7a3c03eaaccce2' 
  AND token = 'tvcA4jcZFPg23CS0Ud/ZAZWAKnHhVVnaqpW8KwTwzDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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