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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728cc7a85ad4daea5cbec14f65b5d51540b4c68f5ae29f869bd2e99bf6422c2e' 
  AND token = 'xvKqxmsqMWuEP1dz87CQSOIjdj+w4QZQVM6SOJ4qbuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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