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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7a6bb67e34cfe91a006bfd45eca502069ae79a640b54b7590433f7a32ee954' 
  AND token = '24fgkw7681qdI+CjK+nJdFGej+Qb4rwfEj1SMNXVvAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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