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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486da93b805130ea89afbb17f4999ec6577834b7bc2d8c824418d90ffea3f998' 
  AND token = 'XxCcFHU6H3z1kIM9HDZjY0i31AjwZNVx0Jl+juFXd94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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