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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7df99cb5eeed19ba4c5021d1722c0da5b49cfbf364edcbfda2f137fde8a48e' 
  AND token = 'l+Zkb7xli492J3ELL8MIP8W5Z2lhsewlPwPL9ibbstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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