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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306b1a50af811af4586e0b1af0a3c2ddd3b81bfecdb823b4205525d536af51d3' 
  AND token = 'fvJYxsHnuxJyhAa16dS+4IlONajroQb12m/WR6iRmVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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