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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ab936ed0f17147fa8069547282541c6a40a5f5440b30c4e74daa465738d807' 
  AND token = 'lLGtvJFGQ8CN1rcwjrXBN+CnUHv8vWmnBn6XPH8bTik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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