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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9f1b7978b92b5b486c2979c8de2eaaca1cc26804cb23660b1d97b4b750d3f0' 
  AND token = 'Ko51VmHRM5bGed6j9M6bs+9fSswQoyIMVIjgrNhYicc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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