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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c7ec2d7325f733e780758171c48ef43ebb7bffad8fb6242dbc00adac3eda2d' 
  AND token = '+xKIJ681GmWEmlN1GzegUaaq1VeL7dX0cVDpfa/g7Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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