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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fc3a62a2b0c7766ea789def5e8fb0889542dfa21dcaf247fa11ec912f723b8' 
  AND token = 'nBsiExGq4eN/vQsWoKZLEcx8rLlbgj7U4F6dQ9C7cHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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