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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa457c35fca0c4a73e2758004d51076ed41e6bb1079b230f76b7c793ed1146d' 
  AND token = '3guDCxEDOeR+mSeAei7T0PNpSvLsZGaDTPMHIDQQPn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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