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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb56dc686900753aa27ca8e72c2b6e7ef559a9780f276df365c6bd9b0498581' 
  AND token = 'C1230r375Ky44uQqk3gQ4OMn2YN0AojkKf7dMaUuDr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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