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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa77b27e857ef64bab5f03561388712c5e4bc2bd464b646bbeee8b217cc5b77' 
  AND token = 'Pz/LNCSRdpmuFN12j+81PgrfQ9TsbnKysx65zTzlIzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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