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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2956e6aa9a8cf01b7b14c7d889c1f57481c3408690ad7c1d735ad9beb6cba1' 
  AND token = 'L5v8NuCgVzFDpDLufaFd7sqyIJFcPGC5WXcZWFDxcXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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