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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec479b527e94f3e407240974207b50ffadeb49f64836c7874faebf61f9d278ce' 
  AND token = 'cpnnd1KSSRpN8VzGa7K+uSU096kYgcVMcZtFOlDS90U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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