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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779917e82a5cfb19bbd71c9954147e31a6dc026d0e677a0c2be3622136a189eb' 
  AND token = 'G0rT9a4kDYc9if7fl0YabycY/x5xShXuHrSPIEjX5tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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