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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8296a965f10102e30603fac0b5e1b2f1283347e65619983fab0d3e98bfdd3823' 
  AND token = 'XWonyXnRANQHKS6Z43+vNxEgPC3j3cgJRUVlsC/NbSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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