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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19da69a4f7d59e8ae0f6a3c0d2622ab426c697b1c6e0c41d1cfcebd837a4e82a' 
  AND token = 'jZnL5NvIGAR2eZOJub4IZ0Wk1SE2W+5/26oCHH8RU2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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