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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43df3215f3eb1f19c36c739134181e274d31775b93e55ae7eeed1ebad86c0ea6' 
  AND token = 'Uc3nDWwVwWLdgjNsy+xiwtuTLGPQmC7J79CUaBJ/f/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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