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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1498a83c15990b308cbbeeea4a286eecf4e9b062587f8fe8599ad270fdbb6a8a' 
  AND token = 'UmJPTM5u7U8rgMNC15/3NivUDBqEXr3/prq6dlsVjco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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