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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c88365df6d7cdc1a8b30c51e93885b711e0cfbd472149dfd028e5ec4c15d2c2' 
  AND token = 'OrrxpEI/FrnFx1FEoFMcxcyu9IsdBCm61+F4EAza0jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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