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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533132ce772942f5704f88db874d6b338aee25e41e5ad3cb5589c6744b396d54' 
  AND token = 'NrbRR6Ydw3fGNShBZ5OsbvfZ0NzVvkLYezh7Vn5cTZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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