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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea1b0e3772cf35508a9eb76c651b752cf95fa63939c44c31430de73037758cc' 
  AND token = 'LUjXSDHjdik7gAbtoB8O7JG44D7WMvAyBniAdV7/Exs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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