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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55c0d1fc6ee093fbb5e92a75178163695d251746e86a500f569e80ce9921d58' 
  AND token = 'wUnn6Zwpaw2pBCU1oYTkR37jX3flicD8vLzWAdWBUK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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