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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393717d5b2d30f0f5e25a1874530a63bfa2622b512ed735c27a6e0c77096b6d1' 
  AND token = 'fOlbMX4wThoHpGGN5KFEnole+ZJMrGIV8XR7a7orwoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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