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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193ecbee53b10a1902d24afe634ba5d9ea6d4e422751342276c2e37e7b06af5d' 
  AND token = 'iDBZDUKK/3/ZjJ1rTqkcGAgjSFY/1ZvdDrtiClQ6vXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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