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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d524a459c243dc8d9b0511dd53e62bac120ebbcddaafec7040302d44e9ed054' 
  AND token = '3OaB2iVBl7SfzY58CKUd5WvnMVpwDF6Ywkqsvvz/O90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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