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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9480f9c3d0ef685130785f5a0b27911c00effb4d713cc0b7a58bf7aed328070e' 
  AND token = 'v+72PMs4uypxuX8qlgfgeQlo7gXmTpaYI61yKc7OjYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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