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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a96656b5533090df1af72d0a4362140354dc313d16e240024486e9e02b214' 
  AND token = 'e2v6B4g+FcsS9BVnKWu9l2SFA6punx1TzS6gfaEeUZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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