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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bc3b491e47e03afd9ecf0eb117f154ef7365de44e288a76262104f499904fe' 
  AND token = 'XS8ZmlyY/sohQ1UKFYxpSfIkmEDR8KBIKZ/oGl2QimQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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