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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f62d8455f79ecea763a80628e7bc6646067bfabbc4940409e1f23a637fef15' 
  AND token = 'moZvNclBoXl4k6CDeIZomVk7hPZuJH3ly57IgaQsRMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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