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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d99d77272decde7edc588d7b1669b59f487c6a980cbd61ebd61ce4c4aab1f9' 
  AND token = 'bp/HsM99OzLq8exr3EFq1Av/+aUdgW5nJz6ds1P0ut4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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