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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2b4d4ed63aa7e51f36c3b18ef1f621d337aee6c71c7115c102a2cecaf90bea' 
  AND token = 'O9lEjuFsr6RwGO3GRvzp60Qel9rvyBAMw1tJioIewwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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