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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51d65411b1f2e28286f9049c11bcee03fc6e75747cf520d008abeb17706d7e1' 
  AND token = 'ivFdp26J648nhGa7YtSPT2nY+7okxgbqLRaISOWHJqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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