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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47cda1694abb4371dc5316d38c7927676caaba5d27b3ad8e0652ade85125e90' 
  AND token = '3QM24bVP9miRaU0quBkT9h4Sih7Y0f8Nv+CwE46Tl7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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