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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82898e35a679eea6afc38cb1b4b9e44263b0b8ecf97df0bfa91c2af9a491b0b' 
  AND token = 'd3CAJ0W5OZaFMPCbMkbtni0bDofUsqwon4SMc2Zvhwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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