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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae080fb63207542277a40c4a98c063b84faf22dca30322a38b851cbfe14ad10' 
  AND token = 'Pq8hjNEKi43539MKsQEMAWNRzuYLT6wpuyXkJqGK6ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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