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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab0e054b1965891a5b7c76a8278f1ff77f96cf4a1a01bc22b86a2704585c0e4' 
  AND token = 'BiuE6ZQkgV/OTgeL77ghntBx4mFCkp9oEhd+dhXXDT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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