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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7139237b603f12792540095e4622eacb59368198c8e1c305fbb79476d45c939d' 
  AND token = 'FXUIAlkT/gEJu7f5D/FVMUdU9E33WjIR2Tp1PRvHNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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